Boris Berezovsky, the exiled Russian oligarch and long-time opponent of the Kremlin, has died in Britain at the age of 67, his spokesman said on Saturday, without giving further details.
"Yes, he is dead. It was confirmed to me by his private lawyer this afternoon," Berezovsky's spokesman Tim Bell told AFP by telephone.
British media reported that he had been found dead at his home near London.
Berezovsky last year lost a bitter multi-million pound legal battle with fellow tycoon and Chelsea Football Club owner Roman Abramovich.
He was seeking more than £3 billion ($4.75 billion, 3.8 billion euros) in damages from Abramovich after accusing his rival of blackmail, breach of trust and breach of contract
Berezovsky settled in Britain more than a decade ago after going into "self-imposed exile".
He has already been convicted and jailed in absentia by Russian courts on embezzlement charges.